HTML onkeydown Event Attribute - Playground Example

<!DOCTYPE html>
  <html>
    <head>
      <title>Event Attribute onkeydown</title>
    </head>
  <body>
    <p>Click any button in the form to run the script:</p>
    <input type="text" onkeydown="keyboardTest()">
<script>
function keyboardTest() {
  alert("EXAMPLE: You see this window because you triggered the script"); 
}
</script>
  </body>
</html>